This Exam FM sample reference tests Annuities. At time 5 the payments are 1,000 through 3,000, which decompose into a 500 level annuity-due plus 500 times an increasing annuity-due. Discounting that time-5 value by v to the fifth gives the expression in choice D.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A does not satisfy the time-5 annuity-due decomposition followed by five years of discounting; no distinct standard one-step error is identifiable.
BChoice B does not satisfy the time-5 annuity-due decomposition followed by five years of discounting; no distinct standard one-step error is identifiable.
CChoice C does not satisfy the time-5 annuity-due decomposition followed by five years of discounting; no distinct standard one-step error is identifiable.
EChoice E does not satisfy the time-5 annuity-due decomposition followed by five years of discounting; no distinct standard one-step error is identifiable.
Original practice · fully worked
Original variant: present value of a deferred arithmetic grant stream
A five-payment grant begins with 600 at year 3, and each later annual payment is 200 larger. At a 5% annual effective yield, calculate the present value at time 0.
A 3,657.88
B 3,850.40
C 4,042.92
D 4,235.44
E 4,427.96
Variant answer in brief
Discounting the five payments 600 through 1,400 from years 3 through 7 gives present value 3,850.40, choice B.
Setup
Setup
Generate the five payment amounts and their dates.
Pk=600+200k,tk=3+k,k=0,…,4
Model
Model
Discount every payment directly to time 0 at 5%.
PV=k=0∑4(600+200k)(1.05)−(3+k)
Compute
Compute
The five-term discounted sum is 3850.403044.
PV=3850.40304357
Answer
Answer
The grant's present value is 3,850.40, selecting choice B.
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